POSIXct and geom_vline

[McCreight]

Hi-

I'm still struggling with POSIXct in ggplot, this time with
geom_vline. The results, as you'll see, put the line in the wrong
place or nowhere.


t.start <- as.POSIXct(strptime('1/4/2005/00',"%d/%m/%Y/%H"),tz='MST')
dum.frame <- data.frame(time=as.POSIXct(t.start + (3600*(0:
(1*24))) ,tz='MST'),var1=1:25)
wh.20=which(dum.frame$var1==20)

print(ggplot( dum.frame, aes(x=time,y=var1)) + geom_point() +
geom_vline( data=dum.frame[wh.20,], aes(x=time) ) )

print(ggplot( dum.frame, aes(x=time,y=var1)) + geom_point() +
geom_vline( xintercept=dum.frame$time[wh.20] ) )



Is there a way to make it work?

Thanks,

James

[Hadley Wickham]

Hi James,

You were pretty close. Here are two options that work:

ggplot( dum.frame, aes(x=time,y=var1)) + geom_point() +

geom_vline( data=dum.frame[wh.20,], aes(xintercept=time) )

ggplot( dum.frame, aes(x=time,y=var1)) + geom_point() +

geom_vline( xintercept= as.numeric(dum.frame$time[wh.20] ))

Hadley

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